R3 and L3 on XBox One controller non-functional

Equipment: iOS 13.1.3 (17A878), iPad Pro (12.9-inch) (3rd generation), Minecraft 1.12.1, XBox One controller with fresh batteries

iOS 13 now provides the ability to use an XBox One or PlayStation 4 controller. When paired with an XBox One controller, L3 and R3 (pressing down on each analog stick) does not function in Minecraft.

It is my understanding that iOS 13 now provides for L3 and R3 and Minecraft needs an update to support those buttons. The initial mapping for Sprint, for instance, is to L3. It would be awesome to have these buttons work. Thanks!